Whodat, most adapters don't work because they are designed for the old style open post auto battery, not the closed, sealed post of the new 808 auto batteries. After a year of sealed auto batteries, no one has bothered to update the adapters. They just keep selling the old style and frustrating new users.
But if you are firing the battery, it could be that the post on the battery isn't making contact with the post of the hardware/adapter. You may try prying it up a little.
But if you are firing the battery, it could be that the post on the battery isn't making contact with the post of the hardware/adapter. You may try prying it up a little.